Journal
TETRAHEDRON
Volume 108, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2022.132650
Keywords
Morita-Baylis-Hillman; 3-Oxindolinyl-malononitrile; Nitroallylic acetates; Spirocyclopentane-indolinones; [3+2] annulation
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This study reports a highly selective [3 + 2] annulation reaction between 3-oxindolinyl-malononitrile and 1,3-bielectrophilic nitroallylic acetates, resulting in the formation of multifunctional spirocyclic compounds. The key role of the malononitrile moiety in controlling the reactivity and selectivity has been demonstrated.
3-Oxindolinyl-malononitrile participates as a 1,2-binucleophile in a highly regio- and stereoselective [3 + 2] annulation with 1,3-bielectrophilic nitroallylic acetates leading to spirocyclopentane-indolinones. The reaction takes place in the presence of DABCO in THF at room temperature and affords the multifunctional spirocyclic compounds possessing three chiral centers, including a spiro-chiral center in good to excellent yields and short reaction time. The key role of the malononitrile moiety in controlling the reactivity and selectivity has also been demonstrated. An S(N)2'-intramolecular Michael addition pathway is proposed for the [3 + 2] annulation based on DFT calculation results. (C) 2022 Elsevier Ltd. All rights reserved.
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